The color exhibited by coordination compounds is usually due to the absorption of light by a d-electron,resulting in the promotion of the d-electron from its ground-state d-orbital to a higher energy orbital.The first transition series element expected to have a colorless aqueous solution M²⁺ ion is ________.

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The Answer of The color exhibited by coordination compounds is usually due to the absorption of light by a d-electron,resulting in the promotion of the d-electron from its ground-state d-orbital to a higher energy orbital.The first transition series element expected to have a colorless aqueous solution M²⁺ ion is ________.

The Color Exhibited by Coordination Compounds Is Usually Due to the Absorption